Now I found out, it is not at all the firmware that is the problem, it is the router, when shaking the router all lights starts flashing, when holding it at some positions the lights all stop lighting, and at other some works......
This was why internet-access works but not access to the router.....
I have had problems with the router, loosing contact to WLAN and so on, it seems as if this is a monday-model.
Back to seller.
But thanks for the help.
Klitmoeller